Perhaps you should try some spelling variations:
"aaas symposium sams" » "cas symposium sams", "gras symposium sams", "iass symposium sams", "aaas symposium rams", "aaas symposium ams", "aaas symposium wams"
"acs symposium semi" » "acs symposium sss", "acs symposium sagt", "bacus symposium semi", "lakes symposium semi", "games symposium semi"
"das symposium semi" » "das symposium sss", "das symposium sagt", "das symposion semi", "bacus symposium semi", "lakes symposium semi"
"texas symposium sas" » "texts symposium sas", "texas symposium sans"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("aaas symposium sams") OR ("texas symposium sas"))) OR ((("acs symposium semi") OR ("das symposium semi")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"aaas symposium sams\") or (\"texas symposium sas\"))) or (((\"acs symposium semi\") OR (\"das symposium semi\"))))".
• Removing quotes may allow a broader search: (((( aaas symposium sams ) or ( texas symposium sas ))) or ((( acs symposium semi ) OR ( das symposium semi )))).
• Adding a wildcard symbol may retrieve word variants: (((("aaas symposium sams") or ("texas symposium sas"))) or ((("acs symposium semi") OR ("das symposium semi"))))*.